[Python-Pygame] E.T Must Die 0.3

#!usr/bin/python
#E.T Must Die 0.3
#(C) Doddy Hackman 2015
#Credits : Based on Bush Shootout.py Coded by Nathaniel
#Thanks to Nathaniel

import pygame
from pygame.locals import *
import sys,random,time

pygame.init()

juego = pygame.display.set_mode((860,640))
pygame.display.set_caption("E.T Must Die 0.3")
icono = pygame.image.load("Data/Images/icono.png").convert_alpha()       
pygame.display.set_icon(icono)
pygame.mouse.set_visible(False)
 
letra = pygame.font.Font(None,35)

vida = 200
control = False
	
class mira(pygame.sprite.Sprite):
	def __init__(self):
		pygame.sprite.Sprite.__init__(self)
		self.mira = pygame.image.load("Data/Images/mira.png")
		self.rect = self.mira.get_rect()
		self.rect.x = 860/2
		self.rect.y = 640/2
	def mover(self):
		posicion = pygame.mouse.get_pos() 
		self.rect.x = posicion[0] 
		self.rect.y = posicion[1]
		juego.blit(self.mira,self.rect) 
	def lanzar(self):
		yeah = pygame.sprite.spritecollide(self,lista,dokill=False)
		if yeah:

			global vida
			vida = vida - 10
			pygame.mixer.Sound("Data/Sounds/risa2.wav").play()

class threat(pygame.sprite.Sprite):
	def __init__(self):
		pygame.sprite.Sprite.__init__(self)
		self.imagen = pygame.image.load("Data/Images/avatar.png")
		self.rect = self.imagen.get_rect()
		self.tiempo = 15 
		self.contador = int(self.tiempo)
	def mover(self):
		self.contador += 1
		if self.contador >= self.tiempo:
			self.rect.x = random.randrange(20,850)
			self.rect.y = random.randrange(30,540)
			self.contador = 0
		juego.blit(self.imagen,self.rect)


pygame.mixer.Sound("Data/Sounds/menu.wav").play()
men = pygame.image.load("Data/Images/portada.png")
juego.blit(men,(0,0))
pygame.display.update()
time.sleep(9)

pygame.mixer.init()
pygame.mixer.music.load("Data/Sounds/theme.mp3")
pygame.mixer.music.play()

mira = mira()
threat = threat()

lista = pygame.sprite.Group()
lista.add(threat)

cro = pygame.time.Clock()
mil = 0

while True: 

        mil += cro.tick()
        casi = mil/1000
        casi = 30 - casi

	if casi < 1:
		control = True
		
	for acatoy in pygame.event.get():
                
		if acatoy.type == QUIT:
			sys.exit(1)

		if acatoy.type == MOUSEBUTTONDOWN and acatoy.button == 1: 
		 pygame.mixer.Sound("Data/Sounds/disparo.wav").play()
		 mira.lanzar()
		
	if not control:

			fondo = pygame.image.load("Data/Images/fondo.jpg")
			juego.blit(fondo,(0,0))
			juego.blit(letra.render("Remaining Time : "+str(casi),True,(255,0,0)),(20,10))
			juego.blit(letra.render("Threat "+str(vida),True,(255,0,0)),(700,10))
			mira.mover()
			threat.mover()
			
			if vida == 0:
				over = pygame.image.load("Data/Images/ganaste.png")
				juego.blit(over,(0,0))
				pygame.display.update()
				time.sleep(10)
				sys.exit(1)

	else:
		over = pygame.image.load("Data/Images/perdiste.png")
		juego.blit(over,(0,0))
		pygame.display.update()
		pygame.mixer.Sound("Data/Sounds/risa.wav").play()
		time.sleep(10)
		sys.exit(1)
		
	pygame.time.delay(15)	
	pygame.display.flip()

#The End ?